新型锂离子蓄电池阳极材料CoS_2

Study of CoS_2 as a novel negative electrode material for lithium ion battery

报道了一种新型锂离子蓄电池阳极材料CoS2,利用X射线衍射(XRD)、电子扫描电镜(SEM)和BET等技术研究了其结构和形貌。XRD显示CoS2为立方结构,晶胞参数a=0.5531nm,SEM观察其颗粒大约在30mm,表面有丰富的微结构。对不同乙炔黑含量的材料进行研究发现,乙炔黑含量为30%的样品具有较好的电化学性能,首次最大嵌锂容量高达1280mAh·g-1。非原位XRD研究了材料在充放电过程中结构的变化,同时研究了其反应机理。

Cobalt disulfide was investigated as a promising anode material for lithium ion batteries. The crystal structure and surface morphology have been characterized by using XRD、SEM and BET techniques. The results of XRD show that the sample is a cubic phase. The grain size of sample is 30 mm with a special nanostructure characteristic as observed by means of SEM, Charge-discharge experiments show that the sample with 30% different acetylene black has the best performance that the first lithium insertion capacity is about 1 280 mAh·g-1. Ex-situ XRD experiments were also carried out to determine the structural changes of delithiated / lithiated anode materials and used to analyze the reaction mechanism.